Fix infinite loop when replacing text

tools/editor/code_editor.cpp

@@ -188,7 +188,9 @@ void FindReplaceBar::_replace_all() {
 	text_edit->cursor_set_line(0);
 	text_edit->cursor_set_column(0);
 
+	String replace_text=get_replace_text();
 	int search_text_len=get_search_text().length();
+
 	int rc=0;
 
 	replace_all_mode = true;
@@ -204,7 +206,7 @@ void FindReplaceBar::_replace_all() {
 		if (match_from < prev_match)
 			break; // done
 
-		prev_match=match_to;
+		prev_match=Point2i(result_line,result_col+replace_text.length());
 
 		text_edit->select(result_line,result_col,result_line,match_to.y);
 
@@ -214,12 +216,12 @@ void FindReplaceBar::_replace_all() {
 				continue;
 
 			// replace but adjust selection bounds
-			text_edit->insert_text_at_cursor(get_replace_text());
+			text_edit->insert_text_at_cursor(replace_text);
 			if (match_to.x==selection_end.x)
-				selection_end.y+=get_replace_text().length() - get_search_text().length();
+				selection_end.y+=replace_text.length()-search_text_len;
 		} else {
 			// just replace
-			text_edit->insert_text_at_cursor(get_replace_text());
+			text_edit->insert_text_at_cursor(replace_text);
 		}
 
 		rc++;